Exhaust pipe size?

I was wondering if anybody knows off the top of their head what size pipe is on my 95 olds delta 88 royal? My converter is going bad and I want to change is to a magnaflow high flow but I don't know what size to get. It's been raing like cats&dogs or I would crawl under it to find out, but I figured somebody has done this and knows what my pipe size is.

Thanks in advance,
Don

yea i have a 92 and my cat has been bad for a while it rattles like crazy when im driving because the material inside is broken according to my mechanic but id like to change mine also if anyone knows the side and webpage to buy it

2.5" I have one on my ride.